Niagara Cutter N24081 High Speed Steel Ball Nose End Mill, Weldon Shank, Uncoated Bright Finish, Roughing/Finishing Cut, 30-Degree, 2-Flute, 2.438" OAL, 0.250" Cut Diameter, 0.375" Shank Diameter Two flutes offer better chip-carrying capacity than end mills with more flutes, enhancing the tools ability to remove material High-speed steel (HSS) is compatible with a variety of materials Uncoated (bright) tools have no additional surface treatment or coating for use on a broad range of materials Ball nose end mills (also called ball end) create contoured surfaces Center-cutting design allows the end mill to plunge into material like a drill bit while also performing conventional surface milling